/*
 * Anything: A flexible and easy to use data structure that combines the 
 * characteristics of a list and a hashmap into one data structure.
 * 
 * Based on a paper by Peter Sommerlad and Marcel Rueedi on 
 * 'Do-it-yourself reflection' entered at EuroPLOP 1998.
 * 
 * This library was written completely from scratch and is based only 
 * in spirit on the original Java Anything implementation written by 
 * Andre Weinand/Marcel Rueedi in 1997/99 and enhanced by Stefan Tramm 
 * in 2006.
 * 
 * Copyright (c) 2008 Thomas Marti and others. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package any.impl;


import java.math.BigDecimal;
import java.util.Date;

import any.Any;


final class NullAnything extends SimpleTypeAnything<Object> {

	private static final long serialVersionUID = 1;

	public static final NullAnything INSTANCE = new NullAnything();
	
	private NullAnything() {
		super(null, null);
	}

	public Boolean asBool(Boolean defaultValue) {
		return defaultValue;
	}

	public Double asDouble(Double defaultValue) {
		return defaultValue;
	}

	public Date asDate(Date defaultValue) {
		return defaultValue;
	}
	
	@Override
	protected BigDecimal asBigDecimalImpl() {
		return null;
	}

	@Override
	protected Double asDoubleImpl(Number defaultValue) {
		return null;
	}

	@Override
	public String asString(String defaultValue) {
		return defaultValue;
	}

	public Any toAny() {
		return this;
	}
	
	@Override
	public boolean equals(Object obj) {
		return (obj instanceof NullAnything);
	}
	
	@Override
	public int hashCode() {
		return 0;
	}
	
	@Override
	public String toString() {
		return "*";
	}
	
	@Override
	public String toFullString() {
		return toString();
	}

}
